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Linux File Permissions are the access control enforced by Linux to prevent unauthorized access on resources.
Objective: Learn about File Permissions by doing the following activities and answering questions.
Who is the owner of file /work/guidelines?
Who is the owner of file /work/readme.txt?
Who is the group of file /work/readme.txt?
Can the user teacher read the file /work/readme.txt?
Can user student read the file /work/guidelines?
Make /work/shell executable.
Find all world-readable files.
Find all world-writable files.
Create a new directory /work/sample. Set its permissions such that only the user can read.
Change the group of binary shell to admin group.
Change owner of binary shell to student user.
Find all binaries for which the setuid bit is set.
Set setuid bit for /bin/bash. Change to user student (using switch user or su) and see if root access can be achieved (without exiting back to).
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